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Redescription of Rayososaurus agrioensis Bonaparte (Sauropoda, Diplodocoidea), a rebbachisaurid from the early Late Cretaceous of Neuquén
Geobios ( IF 1.6 ) Pub Date : 2010-09-01 , DOI: 10.1016/j.geobios.2010.01.004
José L. Carballido , Alberto C. Garrido , José I. Canudo , Leonardo Salgado

Abstract The material belonging to the holotype of Rayososaurus agrioensis Bonaparte is redescribed. The great development of the acromion process, directed in a markedly posterior direction, and the ventral margin of the scapula with a strong ventrodistal expansion, interpreted as autapomorphies of the taxon, justify the validity of the species. Although the material is rather fragmentary, the racquet-shaped scapula, the distal expansion positioned at the same height as the proximal expansion, and the well-developed acromion process allow the taxon to be included within Rebbachisauridae. At the same time, the angle of less than 90 between the coracoid articulation and the scapular blade, together with the great development of the acromion process of the scapula, justify its inclusion in a clade situated as a sister group of Cathartesaura . On the basis of the stratigraphic calibration of the phylogenetic analysis, an important diversification event of the rebbachisaurids is deduced during the Hauterivian-Barremian. In this context, the presence of two monophyletic groups, one of which comprises African-European taxa and the other South American taxa, would place the definitive separation of South America and Africa within this time interval.

中文翻译:

重新描述雷龙 agrioensis Bonaparte (Sauropoda, Diplodocoidea),内乌肯晚白垩世早期的雷巴奇龙科

摘要 重新描述了属于农用射线龙波拿巴正模标本的材料。肩峰突显着向后方向发展,肩胛骨的腹侧边缘具有强烈的腹远侧扩张,被解释为分类群的自体变形,证明了该物种的有效性。虽然材料相当零碎,但球拍状的肩胛骨、与近端扩张位于相同高度的远端扩张以及发达的肩峰过程使该分类群能够被包括在 Rebbachisauridae 中。同时,喙突关节和肩胛骨之间小于 90 度的角度,加上肩胛骨肩峰突的巨大发展,证明了它被包含在一个位于 Cathartesaura 姐妹群的进化枝中。在系统发育分析的地层校准的基础上,推断出在豪特里夫-巴雷米亚期发生了一个重要的雷巴克龙科多样化事件。在这种情况下,两个单系群的存在,其中一个包括非洲-欧洲分类群和另一个南美分类群,将使南美洲和非洲在这个时间间隔内明确分离。
更新日期:2010-09-01
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